<template>
	<!-- 城市选择-->
	<view class="city-select">
		<!-- 搜索 -->
		<view class="city-serach"><input @input="keyInput" placeholder="请输入城市名称" class="city-serach-input" /></view>
		<view class="serach-empty-block"></view>

		<scroll-view :scroll-top="scrollTop" scroll-y="true" class="city-select-main" id="city-select-main" :scroll-into-view="toView">
			<view :class="serachCity ? 'hidden' : ''">
				<!-- 当前选择城市 -->
				<view class="hot-title" v-if="activeCity">当前选择城市</view>
				<view class="hot-city location" v-if="activeCity && !serachCity">
					<view class="hot-item" @click="cityTrigger(activeCity)">{{ activeCity[formatName] }}</view>
				</view>
				<!-- 当前定位城市 -->
				<view class="hot-title" v-if="locationCity && locationCity[formatName] != activeCity[formatName]">定位城市</view>
				<view class="hot-city location" v-if="locationCity && !serachCity && locationCity[formatName] != activeCity[formatName]">
					<view class="hot-item" @click="cityTrigger(locationCity)">{{ locationCity[formatName] }}</view>
				</view>
				<!-- 附近地区 -->
				<view class="hot-title" v-if="nearbyArea.length > 0">附近地区</view>
				<view class="hot-city" v-if="nearbyArea.length > 0">
					<template v-for="(item, index) in nearbyArea">
						<view :key="index" @click="cityTrigger(item, 'hot')" class="hot-item">{{ item[formatName] }}</view>
					</template>
				</view>
				<!-- 热门城市 -->
				<view class="hot-title" v-if="hotCity.length > 0">热门城市</view>
				<view class="hot-city" v-if="hotCity.length > 0">
					<template v-for="(item, index) in hotCity">
						<view :key="index" @click="cityTrigger(item, 'hot')" class="hot-item">{{ item[formatName] }}</view>
					</template>
				</view>
				<!-- 城市列表(搜索前) -->
				<view class="citys">
					<view v-for="(city, index) in sortItems" :key="index" v-show="city.isCity">
						<view class="citys-item-letter" :id="'city-letter-' + (city.name === '#' ? '0' : city.name)">{{ city.name }}</view>
						<view class="citys-item" v-for="(item, inx) in city.citys" :key="inx" @click="cityTrigger(item)">{{ item.cityName }}</view>
					</view>
				</view>
			</view>
			<view :class="serachCity ? '' : 'hidden'">
				<!-- 城市列表(搜索后)  -->
				<view class="citys">
					<view v-for="(item, index) in searchDatas" :key="index">
						<view class="citys-item" :key="index" @click="cityTrigger(item)">{{ item.name }}</view>
					</view>
				</view>
			</view>
		</scroll-view>
		<!-- 城市选择索引-->
		<view :class="serachCity ? 'hidden' : ''">
			<view class="city-indexs-view">
				<view class="city-indexs" @touchmove="move">
					<view v-for="(cityIns, index) in handleCity" v-show="cityIns.isCity" :key="index" @click="cityindex(cityIns.forName)"
					 class="city-ins" :class="{'ns-text-color': toView == cityIns.forName}">{{ cityIns.name }}</view>
				</view>
			</view>
		</view>
	</view>
</template>

<script>
	import citySelect from './citySelect.js'

	export default {
		props: {
			//传入要排序的名称
			formatName: {
				type: String,
				default: 'cityName'
			},
			//当前已选城市
			activeCity: {
				type: Object,
				default: () => null
			},
			//当前定位城市
			locationCity: {
				type: Object,
				default: () => null
			},
			//附近地区
			nearbyArea: {
				type: Array,
				default: () => []
			},
			//热门城市
			hotCity: {
				type: Array,
				default: () => []
			},
			//城市数据
			obtainCitys: {
				type: Array,
				default: () => []
			},
			//是否有搜索
			isSearch: {
				type: Boolean,
				default: true
			},
			
		},
		data() {
			return {
				toView: 'city-letter-Find', //锚链接 初始值
				scrollTop: 0, //scroll-view 滑动的距离
				cityindexs: [], // 城市索引
				activeCityIndex: '', // 当前所在的城市索引
				handleCity: [], // 处理后的城市数据
				serachCity: '', // 搜索的城市
				cityData: [],
				areaIndexs:{},//地区索引
				//是否已加载
				isLoad: false,
			}
		},
		computed: {
			/**
			 * @desc 城市列表排序
			 * @return  Array
			 */
			sortItems() {
				for (let index = 0; index < this.handleCity.length; index++) {
					if (this.handleCity[index].isCity) {
						let cityArr = this.handleCity[index].citys
						cityArr = cityArr.sort(function(a, b) {
							var value1 = a.unicode
							var value2 = b.unicode
							return value1 - value2
						})
					}
				}
				return this.handleCity
			},
			/**
			 * @desc 搜索后的城市列表
			 * @return Array
			 */
			searchDatas() {
				var searchData = [];
				if(this.serachCity == ''){
					return searchData;
				}
				/* for (let i = 0; i < this.cityData.length; i++) {
					if (this.cityData[i][this.formatName].indexOf(this.serachCity) !== -1) {
						searchData.push({
							oldData: this.cityData[i],
							name: this.cityData[i][this.formatName]
						})
					}
				} */
				let num = 1;
				for (let i in this.areaIndexs) {
					let item = this.areaIndexs[i];
					if (item.title.indexOf(this.serachCity) !== -1) {
						searchData.push({
							oldData: item,
							name: item.show_title
						})
					}
				}
				return searchData
			}
		},
		created() {
			let that = this;
			// 初始化城市数据
			this.cityData = this.obtainCitys
			this.initializationCity()
			this.buildCityindexs()
			this.buildAreaIndexs();//建立地区索引
		},
		watch: {
			obtainCitys(newData) {
				this.updateCitys(newData)
			}
		},
		methods: {
			move(e) {
				var clientY = e.touches[0].clientY;
				var index = 0;

				const query = uni.createSelectorQuery().in(this);
				query.selectAll('.city-ins').boundingClientRect(data => {
					for (let i = 0; i < data.length; i++) {
						let item = data[i];
						if (clientY > parseInt(item.top)) {
							index = i;
						} else {
							break;
						}
					}
					if (this.handleCity[index].isCity) {
						this.toView = this.handleCity[index].forName;
					}
				}).exec();

			},
			/**
			 * @desc 初始化
			 */
			updateCitys(data) {
				if (data && data.length) {
					this.cityData = data
					this.initializationCity()
					this.buildCityindexs()
				}
			},
			/**
			 * @desc 监听输入框的值
			 */
			keyInput(event) {
				this.serachCity = event.detail.value
			},
			/**
			 * @desc 初始化城市数据
			 * @return undefind
			 */
			initializationCity() {
				this.handleCity = []
				const cityLetterArr = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R',
					'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '#'
				]
				for (let index = 0; index < cityLetterArr.length; index++) {
					this.handleCity.push({
						name: cityLetterArr[index],
						isCity: false, // 用于区分是否含有当前字母开头的城市
						citys: [], // 存放城市首字母含是此字母的数组
						forName: 'city-letter-' + cityLetterArr[index] //label的绑定
					})
				}
			},
			/**
			 * @desc 得到城市的首字母
			 * @param str String
			 */
			getLetter(str) {
				return citySelect.getFirstLetter(str[0])
			},
			/**
			 * @desc 构建城市索引
			 * @return undefind
			 */
			buildCityindexs() {
				this.cityindexs = []
				for (let i = 0; i < this.cityData.length; i++) {
					// 获取首字母
					const cityLetter = this.getLetter(this.cityData[i][this.formatName]).firstletter
					// 获取当前城市首字母的unicode，用作后续排序
					const unicode = this.getLetter(this.cityData[i][this.formatName]).unicode

					const index = this.cityIndexPosition(cityLetter)
					if (this.cityindexs.indexOf(cityLetter) === -1) {
						this.handleCity[index].isCity = true
						this.cityindexs.push(cityLetter)
					}

					this.handleCity[index].citys.push({
						cityName: this.cityData[i][this.formatName],
						unicode: unicode,
						oldData: this.cityData[i]
					})
				}
			},
			//建立地区索引
			buildAreaIndexs(){
				let areaIndexs = {};
				for (let i in this.cityData) {
					let item = this.cityData[i];
					areaIndexs[item.id] = item;
				}
				for(let i in areaIndexs){
					let item = areaIndexs[i];
					if(item.level == 3){
						item.show_title = item.title + '，' + areaIndexs[item.pid].title;
					}else{
						item.show_title = item.title;
					}
				}
				//console.log(areaIndexs);
				this.areaIndexs = areaIndexs;
			},
			/**
			 * @desc 滑动到城市索引所在的地方
			 * @param id String 城市索引
			 */
			cityindex(id) {
				this.toView = id
			},
			/**
			 * @desc 获取城市首字母的unicode
			 * @param letter String 城市索引
			 */
			cityIndexPosition(letter) {
				if (!letter) {
					return ''
				}
				const ACode = 65
				return letter === '#' ? 26 : letter.charCodeAt(0) - ACode
			},
			/** @desc 城市列表点击事件
			 *  @param Object
			 */
			cityTrigger(item) {
				// 传值到父组件
				this.$emit('cityClick', item.oldData ? item.oldData : item)
			}
		}
	}
</script>

<style lang="scss">
	//宽度转换vw
	@function vww($number) {
		@return ($number / 375) * 750+rpx;
	}

	view {
		box-sizing: border-box;
	}
	
	.hidden{
		display:none;
	}

	.city-serach {
		width: 100%;
		color: #4a4a4a;
		padding: 20rpx 30rpx;
		background-color: #fff;
		position: fixed;
		left: 0;
		z-index: 10;
		border-bottom: 1px solid #f5f5f5;
		border-top: 1px solid #f5f5f5;

		&-input {
			margin: 0;
			height: 70rpx;
			line-height: 70rpx;
			font-size: 28rpx;
			padding: 0 30rpx;
			border: none;
			border-radius: 70rpx;
			background-color: #f5f5f5;
		}
	}

	.serach-empty-block {
		height: 110rpx;
	}

	.city-select-main {
		position: relative;
		width: 100%;
		height: calc(100vh - 110rpx);
		background: #f7f7f7;
	}

	.city-select {
		position: relative;
		width: 100vw;
		height: 100vh;
		// #ifdef H5 || APP-PLUS
		height: calc(100vh - 44px);
		// #endif
		background: #f7f7f7;

		// 热门城市
		.hot-title {
			padding-left: vww(18);
			width: 100vw;
			font-size: 14px;
			line-height: vww(40);
			color: #9b9b9b;
		}

		.hot-city {
			padding-left: vww(18);
			padding-right: vww(20);
			overflow: hidden;
			width: 100vw;

			.hot-item {
				float: left;
				padding: 0 vww(5);
				margin-right: vww(16);
				margin-bottom: vww(6);
				overflow: hidden;
				width: 190rpx;
				height: 60rpx;
				font-size: 14px;
				text-align: center;

				display: -webkit-box;
				-webkit-box-orient: vertical;
				-webkit-line-clamp: 1;

				line-height: vww(31);
				color: #4a4a4a;
				background: #fff;
				border: 1px solid #ebebf0;
				border-radius: 8rpx;

				&:nth-child(3n) {
					margin-right: 0;
				}
			}

			.refresh-location {
				float: right;
				margin-right: 20rpx;

				.iconfont {
					font-size: 26rpx;
					margin-right: 6rpx;
				}
			}

			.hot-hidden {
				display: none;
				margin-right: 0;
			}
		}

		.citys {
			>view {
				padding: 0 36rpx;
				width: 100%;
				font-size: 14px;
				background: #fff;

				.citys-item-letter {
					margin-left: vww(-18);
					padding-left: vww(18);
					margin-top: -1px;
					width: 100vw;
					line-height: vww(30);
					color: #9b9b9b;
					background: #f6f5fa;
					border-top: none;
				}

				.citys-item {
					width: 100%;
					line-height: vww(34);
					color: #4a4a4a;
					border-bottom: 1px solid #ebebf0;

					&:last-child {
						border: none;
					}
				}
			}
		}

		.city-indexs-view {
			position: absolute;
			right: 0;
			top: 0;
			z-index: 999;
			display: flex;
			// width: 40rpx;
			height: 100vh;
			// #ifdef H5 || APP-PLUS
			height: calc(100vh - 44px);
			// #endif
			text-align: center;
			align-items: center;

			.city-indexs {
				// width: 40rpx;
				text-align: center;
				height: 68%;
				display: flex;
				flex-direction: column;

				>view {
					flex: 1;
					width: 60rpx;
					height: 20rpx;
					font-size: 24rpx;
					color: #333333;
					text-align: center;
				}
			}
		}
	}
</style>
